I've had problems in the past regarding qualifying and it was less fault of my own, rather the company.
I won't explain what happened, but rather a couple tidbits:
If the company did not follow the training guidelines and procedures step by step, you can file a grievance and probably win it. What happens is , they send you to driving school but often send those same people back into the building. Then, after a period of time , on their terms, they recall those employees. That is not the intended use of the training. The drivers are supposed to drive IMMEDIATELY following the integrad. After all, what good is the integrad if you can't apply that knowledge when it's fresh in your head? There is a lot of information in a short amount of time to utilize.
Also, another strategy is NOT using the training book and doing what they want with the new driver. This is not acceptable and worth a grievance, and a good BA will win this every time. What the co will do is put drivers out with whatever amount of work they want you to, and have the on-car deliver everything . (8+ hour dispatches, etc). There are weekly dispatch amounts in the training book that each on-car and center manager sign off on EVERY DAY, and if that is not safisfactory, it can be grieved. For ex: , they send out a driver in his first week with a 9+ hour dispatch when the training manual the on-car signed off with showed 6.5 hr w/ trainer(standard for firstweek)
Another great one is when they lay off drivers WHILE STILL IN 30 DAYS. So by working one day a week for 30 weeks , you can make your 30 days! However, I guarantee you that the co will disqualify you because they don't need the FT driver! So despite there being a job that you bid on, the company doesn't want to honor it so they stall you and then DQ you and hope you don't say anything . Remember, there is no real reason necessary for UPS to come up with , until you complain and get a union rep involved. Then they have some 'splainin to do.
There's even more I can come up with, but these are all red flags that a new driver might have an argument for being disqualified unnecessarily.